| 初论华北东部中生代金成矿的地球动力学背景——以胶东金矿为例 |
| |
| 引用本文： | 刘建明,叶杰,徐九华,姜能,应汉龙.初论华北东部中生代金成矿的地球动力学背景——以胶东金矿为例[J].地球物理学进展,2001,16(1):39-46. |
| |
| 作者姓名： | 刘建明 叶杰 徐九华 姜能 应汉龙 |
| |
| 作者单位： | 1. 中国科学院地质与地球物理研究所,
2. 北京科技大学, |
| |
| 基金项目： | 国家自然科学基金项目! (4 98730 2 2 )，中国科学院资源与生态环境重大项目! (KZ951 A1 4 0 1)，科学院知识创新工程重大项目! (KZCX1 |
| |
| 摘 要： | 山东金矿研究的最新成果表明 ,胶东众多金矿床 (无论矿化类型、产出空间、地质背景的不同)的成矿时代主要集中在 1 1 5± 1 5Ma(早白垩世 )前后这一狭短的时段内 ,暗示它们都受某一次统一的重大地质事件的制约 .金矿石中碳酸盐矿物的碳氧同位素组成显示成矿流体中的CO2 很可能来自深部 (岩石圈地幔甚或更深 ) .1 1 5± 1 5Ma(早白垩世 )前后正是华北东部中生代动力学体制转折的关键时段 ,此时古太平洋板块向欧亚大陆斜向快速俯冲、华北东部岩石圈剧烈减薄、郯庐断裂发生强烈左行走滑、区域构造应力场转变为强烈引张、火山 -岩浆活动也最为强烈、尤其是深源(幔源 )岩浆活动最为强烈 .同时 ,这也与部分学者提出的超级地幔柱的高潮时段 (1 2 5～ 1 0 0Ma)相吻合 ,暗示可能有深部物质 (不仅是上地幔物质 ,还可能包括下地幔物质 )和热能的大规模强烈上涌 .因此 ,胶东金矿 (以及华北东部的许多其它金矿床 )的形成有可能是 1 1 5± 1 5Ma前后华北东部动力学体制转折过程中一次大规模的深部物质和深部能量上涌的结果
|
| 关 键 词： | 金矿庆 深部物质上涌 中生代 成矿时代 碳同位素 地球动力学 氧同位素 |
| 文章编号： | 1004-2903(2001)01-0039-08 |
| 修稿时间： | 2000年8月9日 |
PRELIMINARY DISCUSSION ON GEODYNAMIC BACKGROUND OF MESOZOIC GOLD METALLOGENY IN EASTERN NORTH CHINA — With examples from eastern Shandong Province |
| |
| LIU Jian-ming,YE Jie,XU Jiu-hua,JIANG Neng,YING Han-long.PRELIMINARY DISCUSSION ON GEODYNAMIC BACKGROUND OF MESOZOIC GOLD METALLOGENY IN EASTERN NORTH CHINA — With examples from eastern Shandong Province[J].Progress in Geophysics,2001,16(1):39-46. |
| |
| Authors: | LIU Jian-ming YE Jie XU Jiu-hua JIANG Neng YING Han-long |
| |
| Institution: | LIU Jian ming 1 YE Jie 1 XU Jiu hua 2 JIANG Neng 1 YING Han long 1 |
| |
| Abstract: | Most recently it was demonstrated by isotopic age dating that the most gold deposits in Shandong Province were formed during a short time interval of 115±15 Ma (Earlier Cretaceous), no matter what mineralization type, what kind of geological setting, and where occurred. This fact implies that all the gold deposits might be constraint by a single event at that time. Carbon and oxygen isotope composition of carbonates in gold ores indicates that CO2 in ore-forming fluids was probably derived from deep interior of the Earth (lithospheric mantle or deeper). Interesting that Earlier Cretaceous was coincided with the key time span of transform of geodynamic regime in eastern North China during Mesozoic, that is, the key time span for strong magmatic activity (particularly magmas of mantle sources), strong extensional tectonic process, strong lithospheric thinning, high speed subduction of western Paleo-Pacific plate under Euro-Asian plate, and rising of a possible deep superplume. Thereafter, most of the gold deposits in Shandong Province, or even in the whole eastern North China, was genetically constraint by material/energy rising process during Earlier Cretaceous. |
| |
| Keywords: | Gold deposit Earlier Cretaceous Material rising from deep Earth interior Eastern North China |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
|
